[time-nuts] DSAC launches tonight

jimlux jimlux at earthlink.net
Mon Jun 24 17:21:05 UTC 2019


https://www.jpl.nasa.gov/news/news.php?feature=7430

and, as well, COSMIC-2 is being deployed - 6 satellites each carrying a 
fancy GPS receiver that does two things: Precision Orbit Determination 
(POD) using a choke ring antenna; Occultation measurements of the 
atmosphere using a directive array of helical antennas facing the limb.


https://twitter.com/AF_SMC/status/1141099481628364808 has a nice view of 
the COSMIC-2 satellites - they're in the middle and you can see the  12 
element array. Yes, I suspect that the dimensions of the form for the 
helix are very close to that of a standard small Solo drink cup, but 
these are a fancy 3D printed material that can stand up to radiation and 
atomic oxygen.

These spacecraft fly with the array antennas pointed at the limb




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